To sum up, a nail bent at an angle (2,3)
I believe the answer is:
in all
'to sum up a' is the definition.
I can't judge whether this definition defines the answer.
'nail bent at an angle' is the wordplay.
'bent' is an anagram indicator.
'at' is a charade indicator (letters next to each other).
'an angle' becomes 'l'.
'nail' is an anagram of 'inal'.
'inal'+'l'='IN ALL'
Can you help me to learn more?
(Other definitions for in all that I've seen before include "Taking everything into account" , "Altogether" , "Taken as a whole" , "Completely" , "In total" .)